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arXiv 1202.2833cond-mat.str-el
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强关联系统中的非常规超导理论:实空间配对与统计一致的平均场理论——展望

Theory of Unconventional Superconductivity in Strongly Correlated Systems: Real Space Pairing and Statistically Consistent Mean-Field Theory - in Perspective

Józef Spałek

AI总结:

本文综述强关联体系中基于 t-J 与周期 Anderson-Kondo 模型的实空间配对机制,提出统计一致的重整化平均场理论并给出磁态与超导态相图。

摘要:

在这篇简要综述中,我们讨论了通过相应的低能(t-J 或周期 Anderson-Kondo)有效哈密顿量所表达的实空间配对的主要特征,并考察了这些非常规超导体的具体性质。我们还提出了所谓重整化平均场理论中统计一致性的基本问题。特别是,我们给出了包含稳定磁态和超导态的相图。我们将实空间配对解释为由大小为 J 的短程交换作用耦合的费米子对的关联运动,J 与粒子重整化能带能量 ∼tx 相当,其中 x 是每格点的载流子数。我们还简要讨论了实空间超导来源与顺磁子介导超导来源之间的差异。本文既聚焦于我们研究组近期获得的新结果,也将这些理论概念置于概念和历史的视角中。构建本方法不需要任何从属玻色子。

英文摘要:

In this brief overview we discuss the principal features of real space pairing as expressed via corresponding low-energy (t-J or periodic Anderson-Kondo) effective Hamiltonian, as well as consider concrete properties of those unconventional superconductors. We also rise the basic question of statistical consistency within the so-called renormalized mean-field theory. In particular, we provide the phase diagrams encompassing the stable magnetic and superconducting states. We interpret real space pairing as correlated motion of fermion pair coupled by short-range exchange interaction of magnitude J comparable to the particle renormalized band energy $\sim tx$, where $x$ is the carrier number per site. We also discuss briefly the difference between the real-space and the paramagnon - mediated sources of superconductivity. The paper concentrates both on recent novel results obtained in our research group, as well as puts the theoretical concepts in a conceptual as well as historical perspective. No slave-bosons are required to formulate the present approach.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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